backup-rename: new module It is like backupfile, except it avoids some race conditions, and it does not output to stderr or exit. * MODULES.html.sh: Add backup-rename. * lib/backup-find.c, lib/backup-internal.h, lib/backup-rename.c: * modules/backup-rename: New files. * lib/backupfile.c: Turn this into an internals file, which contains code common to backupfile and backup_rename. Do not include argmatch.h or xalloc.h: include xalloc-oversized.h. Include renameat2.h and fcntl.h. (BACKUP_NOMEM): New constant. (numbered_backup): New args BASE_OFFSET and *DIRPP. Do not exit on memory exhaustion; just return BACKUP_NOMEM. Caller changed. (backupfile_internal): Rename from find_backup_file_name. Support new arg RENAME. (backup_args, backup_types, get_version, xget_version): Move to lib/backup-find.c. * lib/backupfile.h (backup_file_rename): New decl. * modules/backupfile (Files): Add lib/backup-internal.h, lib/backup-find.c. (Depends-on): Add dirfd, fcntl, renameat2. (lib_SOURCES): Add backup-find.c.

--- a/MODULES.html.sh	Sun Jul 30 10:53:32 2017 -0700
+++ b/MODULES.html.sh	Sun Jul 30 10:53:32 2017 -0700
@@ -2637,6 +2637,7 @@
   func_module areadlinkat
   func_module areadlinkat-with-size
   func_module backupfile
+  func_module backup-rename
   func_module canonicalize
   func_module canonicalize-lgpl
   func_module chdir-safer